How Do I get The Object Variable Name?

[onenonly]

Can something help me get this to work without using name properties?
Can it even be done?

var bottomRight:Sprite = new Sprite();
    bottomRight.graphics.beginFill(0x00FF00, 0.2);
    bottomRight.graphics.drawRect(775, 615, 25, 25);
    bottomRight.graphics.endFill();
    this.addChild(bottomRight);
    



        
this.addEventListener(MouseEvent.MOUSE_OVER, toolTip);        
function toolTip(event:MouseEvent):void{

         // I Want something like this to work : )

         if(event.target.varName == 'bottomRight'){
                   trace('WORKING');
         }
        

     

     
    
    
}